Lets speculate about how much 1520 could score in Verge review.
If we use 1020 as a base number it scored following.
- Design 7
- Display 9
- Camera(s) 10
- Reception / call quality 8
- Performance 9
- Software 7
- Battery life 9
- Ecosystem 5
Now lets talk about what 1520 could score
It most certainly is better looking than 1020 and is Hybrid of 925 and 720 which both scored 9. Its quite thin but it size can drop score to 8.
All facts taking in to count it should score 10. Higher PPI and even better visibility in bright light
We have seen comparison to 1020 in here WP forum and photo quality looks similiar to me. It's just few samples, but combine it to power of Snapdragon 800 for faster image capture and prosessing and better OIS performance(it looked much smoother on video sample) it should be 10
- Reception / call quality 9
Considering phones bigger size it should have better antennas and also 800 chip-set should improve thinks
Snapdragon 800, need i say more
It's WP but have few Enchantments by Nokia that wasn't when 1020 was reviewed like notifications on glance screen. Also orientation lock is coming along GDR3 update. If they are generous they give it 8, but most likely it is still 7
By sheer numbers it should score that
Official Instagram

that alone should boost score to 6. I personally give a **** about Instagram. It should be least 6 even wo Instagram, since more important apps that were missing back then are now available.
So, is it Plausible?